Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d6d824a69a3cd3df…

MALICIOUS

Office (OOXML)

237.3 KB Created: 2018-02-22 20:02:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2021-05-29
MD5: c1cce58ed15cd0ade40006ae04e50cb7 SHA-1: 2331bd8e627a2c81eca4afe780b1ed22c2660557 SHA-256: d6d824a69a3cd3dfa75973c5fb146732b1b8860cc7a7caafca5f776769d018a7
224 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample contains VBA macros, specifically an Auto_Close macro that utilizes the Shell() function. This indicates the document is designed to execute arbitrary code upon opening or closing. The ClamAV detection 'Doc.Dropper.Agent-6467238-0' further supports its malicious nature as a dropper. The obfuscated VBA code suggests an attempt to hide the execution of a second-stage payload, likely downloaded from an external source.

Heuristics 7

  • ClamAV: Doc.Dropper.Agent-6467238-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6467238-0
  • VBA project inside OOXML medium 3 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.microsoft.com/office/word/2010/wordprocessingCanvas In document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/mathIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeIn document text (OOXML body / shared strings)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 136699 bytes
SHA-256: 5c1fab92ebfa88d63d8c69106a262c4081748aefeb1ec74af950fbd78f0871a6
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 97 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Attribute VB_Name = "Module1"

Attribute VB_Name = "Module2"
Function XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX(XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX, XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX, XXXXXXXX)
  XXXXXXXXXXXXXXXXXXXXXXXXXX = "XXX"
  XXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXX + "XXXXXXXX"
  XXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXX + "XXXXXXXX"
  XXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXX + "XXXXXXX"
  XXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXX + "XXXX"
  XXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXX + "XXXXXXX"
  XXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXX + "XXXXXXXX"
  XXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXX + "X"
  XXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXX + "XXXXXXXXX"
  XXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXX + "X"
  XXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXX + "X"
  XXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXX + "X"
  XXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXX + "XXXXXXX"
  XXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXX + "XXXX"
  XXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXX + "XXXX"
  XXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXX + "XXXXXXXXX"
  XXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXX + "XXXXXX"
  XXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXX + "XXXXX"
  XXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXX + "XXX"
  XXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXX + "XXXXXXX"
  XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX = Mid(XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX, XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX, XXXXXXXX)
  XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX = "XXXXXXXX"
  XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + "XXXXXXXX"
  XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + "XXXX"
  XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + "XXXXXXXX"
End Function

Function XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX(XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX)
  XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX = "XX"
  XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + "XXXXX"
  XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + "XX"
  XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + "XXXX"
  XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX = StrReverse(XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX)
  XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX = "XXXXXXX"
  XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + "XXXXX"
  XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + "XXXX"
  XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + "XXXX"
  XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + "XXXXXXXXX"
  XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + "XXXXXXX"
  XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + "XXX"
  XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + "XXX"
  XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + "XXXX"
  XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX = XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + "XXXXXX"
  XXXXXXXXXXXXX
... (truncated)
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 168448 bytes
SHA-256: d2202d50af013e03e76b4b077e4f33295cd81ceb545ea1257717ca5d08dbc95f
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 97 long base64-like blob(s).

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